what could cause this and do you have a D.I.Y. solution to this issue.is this a common problem
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2000 Ford Expedition Question: heater is blowing cold air when on hot have replaced radiator and flushed?
Answer #1G. T. Service Center (4231 Answers) , Stephenville, TX - (254) 638-3236ProfessorG January 08, 2014, 21:09Master
Check the heater to ensure the trash you just flushed didn't go into the core and stop it up as well. Next would be to check/test the temp/blend door actuator.
Answer #2Greg's Orange Auto (14224 Answers) , Orange, CA - (714) 361-9386globalhelper January 09, 2014, 06:19Master
also ck coolant level